I have just retired and am looking forward to having more time to spend with programming. I am not a professional programmer and I'm still learning. I just ordered a GIGA R1. It should be here next week. I have authored two libraries for the Teensy boards. Ra8876LiteTeensy and MSC which is now part of USBHost_36 library for Teensy. Both of these libraries were optimized by several members of the Teensy forum.